For all help and discussion relating to visual effects in programs that are not already covered in an existing forum, such as Blender, Particle Illusion, etc., along with discussion about effects theories and techniques.

Can you only use an image with "sharp" edges for the matte? For example, if I wanted to use a heart, could I only use a heart shape that had a very definitive outline as opposed to one that was fuzzed-out or blurred?